[Bug testsuite/108973] New: Sufficiently narrow terminal window causes selftest failure

["acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108973

            Bug ID: 108973
           Summary: Sufficiently narrow terminal window causes selftest
                    failure
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

Running the selftests in a sufficiently-narrow terminal window (in my case
$COLUMNS < 42) causes the following selftest failure:

$ echo $COLUMNS
41
$ ./xgcc -B . -c -xc /dev/null
-fself-test=$HOME/toolchain/src/gcc/gcc/testsuite/selftests
/home/alecop01/toolchain/src/gcc/gcc/diagnostic-show-locus.cc:4452:
test_add_location_if_nearby: FAIL: ASSERT_STREQ (" struct same_line { double x;
double y; ;\n" "                  ~                    ^\n", pp_formatted_text
(dc.printer))
 val1=" struct same_line { double x; double y; ;
                  ~                    ^
"
 val2=" truct same_line { double x; double y; ;
                 ~                    ^

"

cc1: internal compiler error: in fail_formatted, at selftest.cc:63
0x2b02675 selftest::fail_formatted(selftest::location const&, char const*, ...)
        /home/alecop01/toolchain/src/gcc/gcc/selftest.cc:63
0x2b02764 selftest::assert_streq(selftest::location const&, char const*, char
const*, char const*, char const*)
        /home/alecop01/toolchain/src/gcc/gcc/selftest.cc:92
0x2b24547 test_add_location_if_nearby
        /home/alecop01/toolchain/src/gcc/gcc/diagnostic-show-locus.cc:4450
0x2b51737 selftest::for_each_line_table_case(void (*)(selftest::line_table_case
const&))
        /home/alecop01/toolchain/src/gcc/gcc/input.cc:3899
0x2b2bf52 selftest::diagnostic_show_locus_cc_tests()
        /home/alecop01/toolchain/src/gcc/gcc/diagnostic-show-locus.cc:5706
0x29c8f24 selftest::run_tests()
        /home/alecop01/toolchain/src/gcc/gcc/selftest-run-tests.cc:96
0x15d19c4 toplev::run_self_tests()
        /home/alecop01/toolchain/src/gcc/gcc/toplev.cc:2184
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